I have two comments:
1. Directly to the question, I personally like stockings, garder belts, things with straps, lacy things, and high heels (high heels have to come off in bed though lol)
2. When SLEEPING, I always sleep nude with my gfs. In fact, it isnt even an option for the girl if she wants to sleep next to me. NOTHING beats sleeping nude next a good-looking - hot girl... Very intimate and BEST sleep you'll ever have. But when it comes to foreplay I like to refer to #1 (above).
EDIT
On another note, I think it is also INSANELY hot when a gf wears one of my shirts with short boxers or panties (with her hair down and minimum make-up). Not for a special occasion but that is how I usually like to be greated if I come over after hours.
